adds fieldoffset, fixes #218 (#260)

* adds fieldoffset, fixes #218

* fixes fieldoffset to return a UInt

* fixes fieldoffset on v0.3

README.md

@@ -199,6 +199,8 @@ Currently, the `@compat` macro supports the following syntaxes:
 
 * `slice` is now `view`[#16972](https://github.com/JuliaLang/julia/pull/16972) do `import Compat.view` and then use `view` normally without the `@compat` macro.
 
+* `fieldoffsets` has been deprecated in favor of `fieldoffset`[#14777](https://github.com/JuliaLang/julia/pull/14777).
+
 ## New macros
 
 * `@static` has been added [#16219](https://github.com/JuliaLang/julia/pull/16219).

src/Compat.jl

@@ -1297,6 +1297,11 @@ else
     end
 end
 
+if VERSION < v"0.5.0-dev+2285"
+    fieldoffset(T, i) = @compat UInt(fieldoffsets(T)[i])
+    export fieldoffset
+end
+
 if !isdefined(Base, :view)
     const view = slice
 end

test/runtests.jl

@@ -267,6 +267,8 @@ if VERSION < v"0.4.0-dev+3609"
     end
 end
 
+@test fieldoffset(Complex{Float32}, 2) === @compat UInt(4)
+
 @test parse(Int8, '9') == convert(Int8, 9)
 @test parse(Int, 'a', 16) == 10
 @test parse(Int, "200") == 200